Composition and method for purging polymer processing equipment
US6384002B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 27, 2001 |
| Grant date | May 7, 2002 |
| Priority date | — |
| Expiry date | Apr 27, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D2111/20
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A composition and method purge resin deposits from the inner surfaces of polymer processing machinery upon the flow of a stream of resin through the polymer processing machinery. The composition includes a mixture of purging agents separate from the resin that are poured into the stream of resin as an additive. The purging agents include a blowing agent to induce foaming of the stream of resin and an abrasive to scrub the resin deposits from the inner surfaces of the polymer processing machinery. The purging agents further include a surfactant to promote the flow of the stream of resin along the inner surfaces of polymer processing machinery. A binder binds the purging agents together in the mixture. The method includes feeding a mixture comprised of a blowing agent, an abrasive, a surfactant, and a binder into the stream of resin entering the polymer processing equipment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.